Multiplayer features like camps and events suggest the possibility for encounters that demand communication and team tactics, but I hope that's also replicated in the less open multiplayer, where you're just on a trip into a dungeon with a few mates. That's also the place where people are more likely to make a real effort to work together POE currency trade .

There are ways to make co-op more engaging outside of combat, too. Path of Exile, for instance, features a few trap-infested puzzle areas. These can be enjoyed entirely on your own, but I quite fancy the idea of solving some dungeon conundrums with my smarter friends. Just a few obstacles that can't be solved with a sword, and which encourage teamwork, would go a long way to making me want to play with other humans.

Make character progression its own adventure

(Image credit: Blizzard)
If you're remotely interested in experimenting with character builds, theorycrafting and getting stuck into a lot of numbers, then there's no ARPG that can compete with Path of Exile. The trinity of active skills, passives and gear is absurdly elaborate, turning nurturing your character into an adventure that will take you all across the daunting map of passive skill nodes. It will be hard for me to go back to anything less ambitious.

Diablo 4 shouldn't try to match the complexity of Path of Exile—it might be nice to play an ARPG that doesn't come with maths homework again—but it could certainly do with trying to capture some of the tantalising breadth of Path of Exile's possibilities. This is not to say that Diablo 3 hasn't left me tweaking and testing to create the most devastating builds, but it always feels like I'm going down well-trodden paths instead of charting my own course Path of exile currency .